Chemistry Textbooks 85 Organic 78 Laboratory manuals 70 Problems, exercises, etc 68 Physics 60 Mathematics 51 יותר ... Dictionaries 50 Study and teaching 47 Handbooks, manuals, etc 46 Periodicals 43 Wood 42 Experiments 40 Congresses 39 Data processing 32 Biochemistry 31 Chemistry, Organic 25 Physical and theoretical 25 Biological chemistry 21 Study and teaching (Secondary) 19 History 18 Programmed instruction 18 Inorganic 16 Science 15 Cellulose 14 Research 14 Environmental chemistry 13 Manipulation 13 Statistical methods 13 Study and teaching (Higher) 13 פחות ...